//
//  NCMainCommon.swift
//  Nextcloud
//
//  Created by Marino Faggiana on 18/07/18.
//  Copyright © 2018 TWS. All rights reserved.
//
//  Author Marino Faggiana <m.faggiana@twsweb.it>
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
//

import Foundation

class NCMainCommon: NSObject {
    
    @objc static let sharedInstance: NCMainCommon = {
        let instance = NCMainCommon()
        return instance
    }()
    
    let appDelegate = UIApplication.shared.delegate as! AppDelegate
    
    @objc func cellForRowAtIndexPath(_ indexPath: IndexPath, tableView: UITableView ,metadata: tableMetadata, metadataFolder: tableMetadata?, serverUrl: String, autoUploadFileName: String, autoUploadDirectory: String) -> UITableViewCell {
        
        // Create File System
        if metadata.directory {
            CCUtility.getDirectoryProviderStorageFileID(metadata.fileID)
        } else {
            CCUtility.getDirectoryProviderStorageFileID(metadata.fileID, fileName: metadata.fileNameView)
        }
        
        // CCCell
        if metadata.status == k_metadataStatusNormal {
            
            // NORMAL
            
            let cell = tableView.dequeueReusableCell(withIdentifier: "CellMain", for: indexPath) as! CCCellMain
            cell.separatorInset = UIEdgeInsetsMake(0, 60, 0, 0)
            cell.accessoryType = UITableViewCellAccessoryType.none
            cell.file.image = nil
            cell.status.image = nil
            cell.favorite.image = nil
            cell.shared.image = nil
            cell.local.image = nil
            cell.imageTitleSegue = nil
            cell.shared.isUserInteractionEnabled = false
            
            cell.backgroundColor = NCBrandColor.sharedInstance.backgroundView
            
            // change color selection
            let selectionColor = UIView()
            selectionColor.backgroundColor = NCBrandColor.sharedInstance.getColorSelectBackgrond()
            cell.selectedBackgroundView = selectionColor
            cell.tintColor = NCBrandColor.sharedInstance.brandElement
            
            cell.labelTitle.textColor = UIColor.black
            cell.labelTitle.text = metadata.fileNameView
            
            // Share
            let sharesLink = appDelegate.sharesLink.object(forKey: serverUrl + metadata.fileName)
            let sharesUserAndGroup = appDelegate.sharesUserAndGroup.object(forKey: serverUrl + metadata.fileName)
            var isShare = false
            var isMounted = false
            
            if metadataFolder != nil {
                isShare = metadata.permissions.contains(k_permission_shared) && !metadataFolder!.permissions.contains(k_permission_shared)
                isMounted = metadata.permissions.contains(k_permission_mounted) && !metadataFolder!.permissions.contains(k_permission_mounted)
            }
            
            if metadata.directory {
                
                // lable Info
                cell.labelInfoFile.text = CCUtility.dateDiff(metadata.date as Date)
                
                // File Image & Image Title Segue
                if metadata.e2eEncrypted {
                    cell.file.image = CCGraphics.changeThemingColorImage(UIImage.init(named: "folderEncrypted"), multiplier: 3, color: NCBrandColor.sharedInstance.brandElement)
                    cell.imageTitleSegue = UIImage.init(named: "lock")
                } else if metadata.fileName == autoUploadFileName && serverUrl == autoUploadDirectory {
                    cell.file.image = CCGraphics.changeThemingColorImage(UIImage.init(named: "folderPhotos"), multiplier: 3, color: NCBrandColor.sharedInstance.brandElement)
                    cell.imageTitleSegue = UIImage.init(named: "photos")
                } else if isShare {
                    cell.file.image = CCGraphics.changeThemingColorImage(UIImage.init(named: "folder_shared_with_me"), multiplier: 3, color: NCBrandColor.sharedInstance.brandElement)
                    cell.imageTitleSegue = UIImage.init(named: "share")
                } else if isMounted {
                    cell.file.image = CCGraphics.changeThemingColorImage(UIImage.init(named: "folder_external"), multiplier: 3, color: NCBrandColor.sharedInstance.brandElement)
                    cell.imageTitleSegue = UIImage.init(named: "shareMounted")
                } else if (sharesUserAndGroup != nil) {
                    cell.file.image = CCGraphics.changeThemingColorImage(UIImage.init(named: "folder_shared_with_me"), multiplier: 3, color: NCBrandColor.sharedInstance.brandElement)
                    cell.imageTitleSegue = UIImage.init(named: "share")
                } else if (sharesLink != nil) {
                    cell.file.image = CCGraphics.changeThemingColorImage(UIImage.init(named: "folder_public"), multiplier: 3, color: NCBrandColor.sharedInstance.brandElement)
                    cell.imageTitleSegue = UIImage.init(named: "sharebylink")
                } else {
                    cell.file.image = CCGraphics.changeThemingColorImage(UIImage.init(named: "folder"), multiplier: 3, color: NCBrandColor.sharedInstance.brandElement)
                }
                
                // Image Status Lock Passcode
                let lockServerUrl = CCUtility.stringAppendServerUrl(serverUrl, addFileName: metadata.fileName)!
                let tableDirectory = NCManageDatabase.sharedInstance.getTableDirectory(predicate: NSPredicate(format: "account == %@ AND serverUrl == %@", appDelegate.activeAccount, lockServerUrl))
                if tableDirectory != nil && tableDirectory!.lock && CCUtility.getBlockCode() != nil {
                    cell.status.image = UIImage.init(named: "passcode")
                }
                
            } else {
                
                let iconFileExists = FileManager.default.fileExists(atPath: CCUtility.getDirectoryProviderStorageIconFileID(metadata.fileID, fileNameView: metadata.fileNameView))
                
                // Lable Info
                cell.labelInfoFile.text = CCUtility.dateDiff(metadata.date as Date) + " " + CCUtility.transformedSize(metadata.size)
                
                // File Image
                if iconFileExists {
                    cell.file.image = UIImage.init(contentsOfFile: CCUtility.getDirectoryProviderStorageIconFileID(metadata.fileID, fileNameView: metadata.fileNameView))
                } else {
                    if metadata.iconName.count > 0 {
                        cell.file.image = UIImage.init(named: metadata.iconName)
                    } else {
                        cell.file.image = UIImage.init(named: "file")
                    }
                }
                
                // Local Image
                let tableLocalFile = NCManageDatabase.sharedInstance.getTableLocalFile(predicate: NSPredicate(format: "fileID == %@", metadata.fileID))
                if tableLocalFile != nil && CCUtility.fileProviderStorageExists(metadata.fileID, fileName: metadata.fileNameView) {
                    cell.local.image = UIImage.init(named: "local")
                }
                
                // Status Image
                let tableE2eEncryption = NCManageDatabase.sharedInstance.getE2eEncryption(predicate: NSPredicate(format: "account == %@ AND fileNameIdentifier == %@", appDelegate.activeAccount, metadata.fileName))
                if tableE2eEncryption != nil &&  NCUtility.sharedInstance.isEncryptedMetadata(metadata) {
                    cell.status.image = UIImage.init(named: "encrypted")
                }
                
                // Share
                if (isShare) {
                    cell.shared.image =  CCGraphics.changeThemingColorImage(UIImage.init(named: "share"), multiplier: 2, color: NCBrandColor.sharedInstance.icon)
                } else if (isMounted) {
                    cell.shared.image =  CCGraphics.changeThemingColorImage(UIImage.init(named: "shareMounted"), multiplier: 2, color: NCBrandColor.sharedInstance.icon)
                } else if (sharesLink != nil) {
                    cell.shared.image =  CCGraphics.changeThemingColorImage(UIImage.init(named: "sharebylink"), multiplier: 2, color: NCBrandColor.sharedInstance.icon)
                } else if (sharesUserAndGroup != nil) {
                    cell.shared.image =  CCGraphics.changeThemingColorImage(UIImage.init(named: "share"), multiplier: 2, color: NCBrandColor.sharedInstance.icon)
                }
            }
            
            //
            // File & Directory
            //
            
            // Favorite
            if metadata.favorite {
                cell.favorite.image = CCGraphics.changeThemingColorImage(UIImage.init(named: "favorite"), multiplier: 2, color: NCBrandColor.sharedInstance.yellowFavorite)
            }
            
            // More Image
            cell.more.image = CCGraphics.changeThemingColorImage(UIImage.init(named: "more"), multiplier: 2, color: NCBrandColor.sharedInstance.icon)
            
            return cell
            
        } else {
         
            // TRASNFER
            
            let cell = tableView.dequeueReusableCell(withIdentifier: "CellMainTransfer", for: indexPath) as! CCCellMainTransfer
            cell.separatorInset = UIEdgeInsetsMake(0, 60, 0, 0)
            cell.accessoryType = UITableViewCellAccessoryType.none
            cell.file.image = nil
            cell.status.image = nil
            
            cell.backgroundColor = NCBrandColor.sharedInstance.backgroundView

            cell.labelTitle.textColor = UIColor.black
            cell.labelTitle.text = metadata.fileNameView
            
            cell.transferButton.tintColor = NCBrandColor.sharedInstance.icon
            
            var progress: CGFloat = 0.0
            var totalBytes: Double = 0
            var totalBytesExpected : Double = 0
            let progressArray = appDelegate.listProgressMetadata.object(forKey: metadata.fileID) as? NSArray
            if progressArray != nil && progressArray?.count == 3 {
                progress = progressArray?.object(at: 0) as! CGFloat
                totalBytes = progressArray?.object(at: 1) as! Double
                totalBytesExpected = progressArray?.object(at: 2) as! Double
            }
            
            // Write status on Label Info
            switch metadata.status {
            case Int(k_metadataStatusWaitDownload):
                cell.labelInfoFile.text = CCUtility.transformedSize(metadata.size) + " " + NSLocalizedString("_status_wait_download_", comment: "")
                break
            case Int(k_metadataStatusInDownload):
                cell.labelInfoFile.text = CCUtility.transformedSize(metadata.size) + " " + NSLocalizedString("_status_in_download_", comment: "")
                break
            case Int(k_metadataStatusDownloading):
                if totalBytes > 0 {
                    cell.labelInfoFile.text = CCUtility.transformedSize(totalBytesExpected) + " - ↓" + CCUtility.transformedSize(totalBytes)
                } else {
                    cell.labelInfoFile.text = CCUtility.transformedSize(metadata.size)
                }
                break
            case Int(k_metadataStatusWaitUpload):
                cell.labelInfoFile.text = NSLocalizedString("_status_wait_upload_", comment: "")
                break
            case Int(k_metadataStatusInUpload):
                cell.labelInfoFile.text = NSLocalizedString("_status_in_upload_", comment: "")
                break
            case Int(k_metadataStatusUploading):
                if totalBytes > 0 {
                    cell.labelInfoFile.text = CCUtility.transformedSize(totalBytesExpected) + " - ↑" + CCUtility.transformedSize(totalBytes)
                } else {
                    cell.labelInfoFile.text = CCUtility.transformedSize(metadata.size)
                }
                break
            default:
                cell.labelInfoFile.text = CCUtility.transformedSize(metadata.size)
            }
            
            let iconFileExists = FileManager.default.fileExists(atPath: CCUtility.getDirectoryProviderStorageIconFileID(metadata.fileID, fileNameView: metadata.fileNameView))

            if iconFileExists {
                cell.file.image = UIImage.init(contentsOfFile: CCUtility.getDirectoryProviderStorageIconFileID(metadata.fileID, fileNameView: metadata.fileNameView))
            } else {
                if metadata.iconName.count > 0 {
                    cell.file.image = UIImage.init(named: metadata.iconName)
                } else {
                    cell.file.image = UIImage.init(named: "file")
                }
            }
            
            // Session Upload Extension
            if metadata.session == k_upload_session_extension && (metadata.status == k_metadataStatusInUpload || metadata.status == k_metadataStatusUploading) {
                
                cell.labelTitle.isEnabled = false
                cell.labelInfoFile.isEnabled = false
                
            } else {
                
                cell.labelTitle.isEnabled = true
                cell.labelInfoFile.isEnabled = true
            }
            
            // downloadFile
            if metadata.status == k_metadataStatusWaitDownload || metadata.status == k_metadataStatusInDownload || metadata.status == k_metadataStatusDownloading || metadata.status == k_metadataStatusDownloadError {
                //
            }
            
            // downloadFile Error
            if metadata.status == k_metadataStatusDownloadError {
                
                cell.status.image = UIImage.init(named: "statuserror")
                
                if metadata.sessionError.count == 0 {
                    cell.labelInfoFile.text = NSLocalizedString("_error_", comment: "") + ", " + NSLocalizedString("_file_not_downloaded_", comment: "")
                } else {
                    cell.labelInfoFile.text = metadata.sessionError
                }
            }
            
            // uploadFile
            if metadata.status == k_metadataStatusWaitUpload || metadata.status == k_metadataStatusInUpload || metadata.status == k_metadataStatusUploading || metadata.status == k_metadataStatusUploadError {
                
                if (!iconFileExists) {
                    cell.file.image = CCGraphics.changeThemingColorImage(UIImage.init(named: "uploadCloud"), multiplier: 2, color: NCBrandColor.sharedInstance.brandElement)
                }
                
                cell.labelTitle.isEnabled = false
            }
            
            // uploadFileError
            if metadata.status == k_metadataStatusUploadError {
                
                cell.labelTitle.isEnabled = false
                cell.status.image = UIImage.init(named: "statuserror")
                
                if !iconFileExists {
                    cell.file.image = CCGraphics.changeThemingColorImage(UIImage.init(named: "uploadCloud"), multiplier: 2, color: NCBrandColor.sharedInstance.brandElement)
                }
                
                if metadata.sessionError.count == 0 {
                    cell.labelInfoFile.text = NSLocalizedString("_error_", comment: "") + ", " + NSLocalizedString("_file_not_uploaded_", comment: "")
                } else {
                    cell.labelInfoFile.text = metadata.sessionError
                }
            }
            
            // Progress
            cell.transferButton.progress = progress
            
            return cell
        }
    }
    
    @objc func triggerProgressTask(_ notification: Notification, sectionDataSourceFileIDIndexPath: NSDictionary, tableView: UITableView) {
        
        guard let dic = notification.userInfo else {
            return
        }
        
        let fileID = dic["fileID"] as! NSString
        _ = dic["serverUrl"] as! NSString
        let status = dic["status"] as! Int
        let progress = dic["progress"] as! CGFloat
        let totalBytes = dic["totalBytes"] as! Double
        let totalBytesExpected = dic["totalBytesExpected"] as! Double
        
        appDelegate.listProgressMetadata.setObject([progress as NSNumber, totalBytes as NSNumber, totalBytesExpected as NSNumber], forKey: fileID)
        
        guard let indexPath = sectionDataSourceFileIDIndexPath.object(forKey: fileID) else {
            return
        }
        
        if isValidIndexPath(indexPath as! IndexPath, tableView: tableView) {
        
            if let cell = tableView.cellForRow(at: indexPath as! IndexPath) as? CCCellMainTransfer {
                
                var image = ""

                if status == k_metadataStatusInDownload {
                    image = "↓"
                } else if status == k_metadataStatusInUpload {
                    image = "↑"
                }
                
                cell.labelInfoFile.text = CCUtility.transformedSize(totalBytesExpected) + " - " + image + CCUtility.transformedSize(totalBytes)
                cell.transferButton.progress = progress
            }
        }
    }
    
    @objc func cancelTransferMetadata(_ metadata: tableMetadata, reloadDatasource: Bool) {
        
        if metadata.session.count == 0 {
            return
        }
        
        let session = CCNetworking.shared().getSessionfromSessionDescription(metadata.session) as URLSession
        
        // SESSION EXTENSION
        if metadata.session == k_download_session_extension || metadata.session == k_upload_session_extension {

            if (metadata.session == k_upload_session_extension) {

                do {
                    try FileManager.default.removeItem(atPath: CCUtility.getDirectoryProviderStorageFileID(metadata.fileID))
                } catch { }
                
                NCManageDatabase.sharedInstance.deleteMetadata(predicate: NSPredicate(format: "fileID == %@", metadata.fileID), clearDateReadDirectoryID: metadata.directoryID)
            } else {
                NCManageDatabase.sharedInstance.setMetadataSession("", sessionError: "", sessionSelector: "", sessionTaskIdentifier: Int(k_taskIdentifierDone), status: Int(k_metadataStatusNormal), predicate: NSPredicate(format: "fileID == %@", metadata.fileID))
            }
         
            self.reloadDatasource(ServerUrl: nil)
            
            return
        }
        
        session.getTasksWithCompletionHandler { (dataTasks, uploadTasks, downloadTasks) in
            
            var cancel = false
            
            // DOWNLOAD
            if metadata.session.count > 0 && metadata.session.contains("download") {
                for task in downloadTasks {
                    if task.taskIdentifier == metadata.sessionTaskIdentifier {
                        task.cancel()
                        cancel = true
                    }
                }
                if cancel == false {
                    NCManageDatabase.sharedInstance.setMetadataSession("", sessionError: "", sessionSelector: "", sessionTaskIdentifier: Int(k_taskIdentifierDone), status: Int(k_metadataStatusNormal), predicate: NSPredicate(format: "fileID == %@", metadata.fileID))
                }
            }
            
            // UPLOAD
            if metadata.session.count > 0 && metadata.session.contains("upload") {
                for task in uploadTasks {
                    if task.taskIdentifier == metadata.sessionTaskIdentifier {
                        task.cancel()
                        cancel = true
                    }
                }
                if cancel == false {
                    do {
                        try FileManager.default.removeItem(atPath: CCUtility.getDirectoryProviderStorageFileID(metadata.fileID))
                    }
                    catch { }
                    NCManageDatabase.sharedInstance.deleteMetadata(predicate: NSPredicate(format: "fileID == %@", metadata.fileID), clearDateReadDirectoryID: metadata.directoryID)
                }
            }
            
            if cancel == false {
                self.reloadDatasource(ServerUrl: nil)
            }
        }
    }
    
    @objc func cancelAllTransfer() {

        // Delete k_metadataStatusWaitUpload OR k_metadataStatusUploadError
        NCManageDatabase.sharedInstance.deleteMetadata(predicate: NSPredicate(format: "account == %@ AND (status == %d OR status == %d)", appDelegate.activeAccount, k_metadataStatusWaitUpload, k_metadataStatusUploadError), clearDateReadDirectoryID: nil)

        guard let metadatas = NCManageDatabase.sharedInstance.getMetadatas(predicate: NSPredicate(format: "account == %@ AND status != %d AND status != %d", appDelegate.activeAccount, k_metadataStatusNormal, k_metadataStatusHide), sorted: "fileName", ascending: true) else {
            return
        }
        
        for metadata in metadatas {
            
            // Modify
            if (metadata.status == k_metadataStatusWaitDownload || metadata.status == k_metadataStatusDownloadError) {
                metadata.session = ""
                metadata.sessionSelector = ""
                metadata.status = Int(k_metadataStatusNormal)
                
                _ = NCManageDatabase.sharedInstance.addMetadata(metadata)
            }
            
            // Cancel Task
            if metadata.status == k_metadataStatusDownloading || metadata.status == k_metadataStatusUploading {
                cancelTransferMetadata(metadata, reloadDatasource: false)
            }
        }
        
        self.reloadDatasource(ServerUrl: nil)
    }
    
    @objc func getMetadataFromSectionDataSourceIndexPath(_ indexPath: IndexPath, sectionDataSource: CCSectionDataSourceMetadata) -> tableMetadata? {
        
        let section = indexPath.section + 1
        let row = indexPath.row + 1
        let totSections = sectionDataSource.sections.count
        
        if totSections < section || section > totSections {
            return nil
        }
        
        let valueSection = sectionDataSource.sections.object(at: indexPath.section)
        guard let filesID = sectionDataSource.sectionArrayRow.object(forKey: valueSection) as? NSArray else {
            return nil
        }
        
        let totRows = filesID.count
        if totRows < row || row > totRows {
            return nil
        }
        
        let fileID = filesID.object(at: indexPath.row)
        let metadata = sectionDataSource.allRecordsDataSource.object(forKey: fileID) as? tableMetadata
      
        return metadata
    }
    
    @objc func reloadDatasource(ServerUrl: String?) {
        
        DispatchQueue.main.async {
            if self.appDelegate.activeMain != nil {
                if ServerUrl == nil {
                    self.appDelegate.activeMain.reloadDatasource()
                } else {
                    self.appDelegate.activeMain.reloadDatasource(ServerUrl)
                }
            }
            if self.appDelegate.activeFavorites != nil {
                self.appDelegate.activeFavorites.reloadDatasource()
            }
            if self.appDelegate.activeTransfers != nil {
                self.appDelegate.activeTransfers.reloadDatasource()
            }
        }
    }
    
    @objc func isValidIndexPath(_ indexPath: IndexPath, tableView: UITableView) -> Bool {
        
        return indexPath.section < tableView.numberOfSections && indexPath.row < tableView.numberOfRows(inSection: indexPath.section)
    }
        
}